JPH0937954A - Sensor mounting state inspection device for baking unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make judgement about a defect in a finished product condition by controlling the on/off operation of a heater for maintaining a baking temperature level after raising the internal temperature of an inner case to the level, and making judgement about the defect of a temperature sensor mounting state on the basis of measurement results obtained over the time when the heater is turned on. SOLUTION: In inspecting a sensor mounting state, an inspection switch 42 is operated. As a result, an inspection mode appears and a switching transistor Q is first turned on at a time m1 via a bread preparation circuit 41. Also, the normally open switch 44 of a relay 43 is closed. Electric power is thereby supplied to a main heater 26, and the internal temperature of an inner case is raised. Then, when an oven sensor 27 detects a temperature rise up to a baking level at a time m2, heating operation is stopped. Also, a measurement circuit 46 measures a time M1 regarding the first actuated state after the rise of the internal temperature from ordinary temperature to the baking temperature level, and a comparison circuit 47 compares the time M1 with a reference time MO. When the time M1 is equal to or longer than the time MO, the existence of a sensor mounting defect is identified and, then, a reporting circuit 49 is actuated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensor attachment state inspection device, and more particularly, to a bread case such as wheat flour, water, yeast or baking powder, which is put into a baking case, and the bread material is kneaded in the baking case to carry out primary fermentation and The present invention relates to a sensor attachment state inspection device suitable for use in a bread maker that bakes bread after secondary fermentation.

[0002]

2. Description of the Related Art Recently, a bread maker capable of easily baking bread has been provided for general households. This baker is a series of steps such as flour, water, yeast, or a baking powder, or the like, is put into a baking case, the bread material is kneaded in the baking case, and then the primary fermentation and the secondary fermentation are performed, followed by baking. Is controlled continuously by time and temperature.

That is, in a bread maker, temperature control is an important factor over time in order to properly bake bread. Therefore, a temperature detection sensor for appropriately managing the cooking temperature of the bread ingredients is attached to the inner case. As the temperature detection sensor, conventionally, a thermistor having a characteristic that the resistance value decreases as the temperature rises is generally used.

In this case, since the thermistor cannot be directly attached to the inner case and it is necessary to interpose the attaching member, even if there is no product variation in the thermistor itself, the measurement performance varies depending on the attachment state. was there. That is, the measurement performance varies due to variations in the mounting member itself and slight errors in the tightening torque. This variation in measurement performance causes good and bad baking operations (specifically, poor baking), which is an important problem that affects the stability of product quality.

By the way, recently, there has been provided a system for inspecting a temperature detecting sensor itself for good or bad, and for a good or bad condition of sensor attachment before shipment at a manufacturing factory. In this system, the heater of the finished bread maker is turned on to heat the inside of the inner case from room temperature, for example, about 20 degrees to about 160 degrees, which is the baking temperature, and a plurality of preset temperatures are set in the heating process. On the basis of the time interval of passing through the temperature measurement point, whether the temperature detection sensor itself is good or bad, or the mounting state is good or bad is determined. Specifically, when a time interval passing through a plurality of measurement points is longer than a preset time interval, it is determined that the product is defective or the mounting is defective.

[0006]

As described above, according to the conventional system, based on the passage time of each measurement point in the heating process from the room temperature to the firing temperature, the quality of the sensor itself,
It is a system that determines whether the sensor is installed properly or not.This system is inspected if the temperature detection sensor is defective or the installation is extremely bad and the bread making operation cannot be controlled properly. Is an inspection of. In other words, it is an inspection to exclude defective products before shipping, and the temperature detection sensor is attached to the inner case in good condition.
It is not an inspection as to whether or not a defect affects breadmaking performance.

That is, it is the actual situation that a conventional system cannot inspect a defect having a slight influence on the baking performance. Therefore, the invention according to claim 1 of the present invention is a sensor attachment state inspection device for a bread maker capable of inspecting a defective sensor attachment state to a degree that slightly affects bread making performance in a finished product state. The purpose is to provide. In order to achieve the object of the invention described in claim 1 most effectively, the invention described in claim 2 of the present invention measures the time of the on state or the off state in the on / off control of the heater. It is an object of the present invention to provide a sensor attachment state inspection device for a bread maker in consideration of timing.

[0008]

In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention is such that a baking case in which a bread material is charged for kneading, fermentation and baking forms an oven chamber. A bread maker, which is disposed inside the case, has a heating heater for heating and cooking the bread ingredients put into the baking case, and a temperature detection sensor for managing the cooking temperature in the inner case. In the step of inspecting the mounting state of the temperature detection sensor, the heating heater is turned on to raise the internal temperature of the inner case to the firing temperature, and then the heating heater is used to keep the internal temperature of the inner case at the firing temperature. Control means for controlling on / off of the heater and on / off of the heating heater by this control means
In the off control, a measuring means for measuring the time of the heater heater in the on state or the off state, a comparing means for comparing the time measured by the measuring means with a preset reference time internally, and this comparing means. Based on the comparison result of
The temperature detection sensor is provided with a determination unit that determines that the mounting state of the temperature detection sensor is defective when the measurement time exceeds the reference time, and a notification unit that notifies the mounting failure based on the determination result of the determination unit. It is characterized by that. As a notifying means, a buzzer is used to notify a mounting failure by sound, and an LED or the like is used to notify by flashing or lighting a lamp.
In the case of informing by a character display such as, various display panels such as a liquid crystal panel are used. According to a second aspect of the present invention, in the first aspect, the measuring means measures the time of the on state or the off state in the first on / off control of the heating heater by the control means. It was done like this.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 is a vertical sectional view showing a schematic structure of the bread maker of the present invention, and FIG. 5 is a front view thereof.
The bread maker 1 includes a cylindrical outer case 3 and an outer case 3
Bottom case 4 having support legs 5 fitted and fixed to the lower end side of the
And an inner case 6 in the shape of a cylindrical container, which is internally provided in substantially the upper half of the outer case 3 and forms an oven chamber. An operation panel 7 having various switches for time setting and baking selection is attached to the center of the front surface of the outer case 3, and
Carrying handles 8 are attached to the left and right target positions.

A transparent glass dome-shaped lid 9 is openably and closably attached to the upper opening of the outer case 3. A frame frame 10 is attached to the peripheral portion of the lid body 9, and the rear side of the frame frame 10 is attached to the outer case 3
The cover 9 is provided so as to be openable and closable about a support shaft 12 of the support bracket 11 by being attached to the support bracket 11 attached to the support bracket 11. A grip 13 is integrally formed on the front side of the forehead frame 10.
The grip 9 is used to open and close the lid 9.

A display / switch mounting board 15 and an arithmetic circuit board 16 are provided inside the front surface of the outer case 3, and the inner case 6 is provided on the upper surface of a base 18 which is vertically fixed to the bottom case 4. The bottom of is fixed. Further, inside the inner case 6, there is provided a baking case 20 in the shape of a cylindrical container having an open upper portion for introducing bread ingredients such as flour, water, yeast or baking powder for kneading, fermentation and baking. .

The baking case 20 has a plurality of locking claws 21 (about two to four are suitable) formed on the bottom thereof, and the locking claws 21 are formed on the bottom of the inner case 6. The plurality of locking pieces 22 (the number of which corresponds to the number of the locking claws 21) are engaged and disengaged by rotation, so that they can be attached to and detached from the inner case 6. At the bottom of the baking case 20, a stirring blade 23 for kneading the introduced bread material is connected to the rotary shaft 24 and arranged, and the bread material mixed by the stirring blade 23 is rotated together. The ridges 25 for preventing the heat are formed in the firing case 2
It is attached to the side surface inside 0.

Although not shown, the stirring blade 23 is not shown.
The rotating shaft 24 is rotationally driven by a driving means including a stirring main motor, a timing pulley, a timing belt, and the like arranged under the base 18, so that the rotating shaft 24 is rotated at an appropriate speed. Here, the appropriate speed means a speed at which the bread ingredients put into the baking case 20 can be sufficiently kneaded without scattering and without unevenness.

Further, a swingable air duct 31 is provided on the upper rear side of the inner case 6 toward the firing case 20 side. The air duct 31 is installed in the bottom case 4 and is open to the outside air. It is connected to the suction port 32. A blower fan 33 driven by a fan motor (not shown) and a heater 34 for heating are arranged in the middle of the blower duct 31.

An annular heat ray radiating main heater 26, which is an electric heating member, is arranged along the inner peripheral surface of the inner case 6, and an oven sensor 27 for measuring the internal temperature of the inner case 6 is provided. It is attached to the front upper portion of the inner wall surface of the inner case 6. In addition to the temperature sensor, a dough sensor 28 for detecting the temperature of the bread material put into the baking case 20 is attached to the upper end of the rotating shaft 24, and the internal temperature of the kiln body 2 is controlled by the yeast bacteria. A thermostat 29, which is a sensor for detecting whether the temperature is equal to or lower than the death temperature, is attached to the outer wall surface of the inner case 6.

Here, the bread making operation by the bread making device 1 having the above configuration will be briefly described. For example, the bread making operation when baking bread is from a residual heat step, a first stirring step, a pause step, a second stirring step, a fermentation step, a rounding step, a waiting time step, a rounding step, a roasting step, a baking step, a cooling step. Therefore, the main heater 26 operates intermittently or continuously from the preheating step to the firing step, and the oven sensor 27 continuously operates from the preheating step to the firing step. The temperature in the case 6 (internal temperature) is measured.

That is, the main heater 26 operates intermittently in the residual heat process to keep the inside of the chamber at a constant temperature t1 within the range of 20 to 40 ° C., and the following first stirring process, resting process, and In the two-stirring step, it operates intermittently depending on the conditions to keep the inside of the storage room at a constant temperature t1 within the range of 20 to 40 degrees, and from the subsequent fermentation step to the roasting step, it operates intermittently. The inside is kept at a constant temperature t2 of around 60 ° C., and in the subsequent firing process, the inside of the refrigerator is operated by operating continuously.
It is controlled to maintain a constant firing temperature t3 (for example, 160 degrees) within a range of 50 to 200 degrees. These temperature controls are performed based on the internal temperature measured by the oven sensor 27.

FIG. 1 shows an electrical configuration of a sensor attachment state inspection device for inspecting a defective sensor attachment state of the bread maker 1 having the above configuration. Outputs of various switches provided on the operation panel 7 are guided to the bread preparation circuit 41 which controls various operations of the bread maker. The operation panel 7 is provided with an inspection switch 42 for inspecting the attachment state of the oven sensor 27, and although not shown, a menu switch for selecting the type of bread (bread, French bread, etc.). , A reservation switch for setting the baking time of the bread, a cancel switch for resetting those initial settings, a switch for changing the reservation time, a switch for setting the clock, a start switch for starting the bread making, and the like.

Further, the output of the oven sensor 27 is led to the bread preparation circuit 41, and the heater control output of the bread preparation circuit 41 is connected to the base of the switching transistor Q whose emitter is grounded through the resistor R. It is connected. A power supply V _DD is applied to the collector of the switching transistor Q, and the other end of the relay 43 whose one end is connected to the power supply V _DD is connected to this collector. Then, the power supply 45 is applied to the main heater 26 by the on / off control of the normally open switch 44 of the relay 43.

On the other hand, the heater control output of the pan adjusting circuit 41 is a measuring circuit 4 for measuring the ON time of the switching transistor Q (that is, the closing time of the normally open switch 44).
6 and the output of the measurement circuit 46 is led to the comparison circuit 47 to which the reference time to be compared is given. The output of the comparison circuit 47 is a determination circuit 48 for determining whether the oven sensor 27 is attached properly or not.
The output of the determination circuit 48 is guided to a notification circuit 49 for notifying the defective mounting state of the oven sensor 27.

Although not shown, the bread preparation circuit 41 is fed with the outputs of the dough sensor 28 and the thermostat 29, and the bread preparation circuit 41 outputs the main motor, fan heater, and fan motor. A control signal is output to each drive circuit. As the notification circuit 49, a buzzer is used for notifying a mounting failure by sound, and an LED or the like is used for notifying by a blinking or lighting of a lamp. Further, in the case of notifying by a character display such as “defective”, it can be displayed on the display attached to the operation panel 7.

Next, the operation of the sensor mounting state inspection device for the bread maker having the above-mentioned structure will be described with reference to the flow chart shown in FIG. 2 and the timing chart of the inspection mode shown in FIG. In the initial state, the switching transistor Q is off by the pan adjusting circuit 41, and the relay 43 is off.

In this state, the user operates the operation panel 7
When the inspection switch 42 is operated, the bread preparing circuit 41 which receives the operation signal executes an inspection mode for inspecting the attachment state of the oven sensor 27 (step S).
1). However, this inspection mode is performed in a state where the bread material is not put in the baking case 20 (that is, a state where no load is applied).

That is, the bread preparation circuit 41 is operated at time m1.
At, the switching transistor Q is turned on,
The relay 43 is turned on and the normally open switch 44 is closed (step S2). As a result, the main heater 2
The power source 45 is supplied to the inner case 6 and the inner temperature of the inner case 6 rises. This increase in internal temperature is measured by the oven sensor 27, and the measurement result is input to the bread preparation circuit 41 in real time.

In the bread preparation circuit 41, the time m2 is calculated based on the internal temperature of the inner case 6 input in real time.
When it is detected that the firing temperature t3 has been reached (step S3), the switching transistor Q is turned off at this point, the normally open switch 44 is opened, and heating by the main heater 26 is stopped (step S4). Therefore, the internal temperature of the inner case 6 rises for a while due to the residual heat, then starts to fall and reaches the firing temperature t3 again at time m3.

The bread preparation circuit 41 includes an oven sensor 27.
It is detected that the internal temperature of the inner case 11 has become equal to or lower than the firing temperature t3 again based on the internal temperature measured by (step S5), the switching transistor Q is turned on again at time m3, and the normally open switch 44 is turned on. Is closed and the power supply 45 is supplied to the main heater 26 (step S6). Therefore, the internal temperature of the inner case 6 then decreases for a while, then starts increasing and reaches the firing temperature t3 again at time m4.

The bread preparation circuit 41 includes an oven sensor 27.
It is detected that the internal temperature of the inner case 11 exceeds the firing temperature t3 again based on the internal temperature measured by (step S8), the switching transistor Q is turned off again at time m4, and the normally open switch 44 is turned on. In the open state, the supply of the power supply 45 to the main heater 26 is stopped (step S9).

In the ON / OFF control of the main heater 26 by the bread preparation circuit 41 as described above, in the measurement circuit 46, the first ON / OFF control after the internal temperature of the inner case 6 reaches the baking temperature t3 from room temperature. The on-state time, that is, the time M1 from time m3 to time m4 is measured (steps S7 and S10), and the measured time M1 is supplied to the comparison circuit 47. That is, the measurement circuit 46 is turned on / off for the first one cycle after the firing temperature t3 is reached.
The off control is performed (step S11), and the time M1 of the on state of the main heater 26 at that time is measured.

The comparison circuit 47 is provided with a reference time M0 for making a comparison with the measurement time M1. Here, the reference time M0 differs depending on the setting conditions such as the volume of the inner case 6, the heat capacity of the heater, and the firing temperature.
For an average bread maker, it is preferable to set the time to about 4 minutes and 30 seconds.

That is, in the comparison circuit 47, the measurement time M
1 is compared with the reference time M0 (step S12),
The comparison result is output to the discrimination circuit 48. Discrimination circuit 48
Then, based on the comparison result in the comparison circuit 47, M1 <M0
When it is, it is determined that the attached state of the oven sensor 27 is good, and when M1 ≧ M0, the oven sensor 2
It is determined that the attachment state of 7 is defective. When it is determined that the mounting state is bad, the notifying circuit 49 is driven to notify the user that the mounting state of the oven sensor 27 is bad (step S1).
3).

That is, when the notification circuit 49 uses a buzzer, the buzzer sounds to give an alarm sound. If the notification circuit 49 uses a lamp, the lamp is blinked or lit to notify.
When displaying characters such as "bad", the characters "bad" are displayed on the display attached to the operation panel 7.

In the above description of the operation, the time measurement of the ON state in the ON / OFF control of the main heater 26 is
The ON / OFF control is performed in the first cycle after the internal temperature of the inner case 6 reaches the firing temperature t3 from room temperature. This is repeated by repeating the ON / OFF control of the main heater 26. This is because the inner temperature gradually converges to the vicinity of the firing temperature t3 (that is, the wave height of the waveform after the time m2 shown in FIG. 3 becomes small), so that the timing most easily measured is the first cycle. However, it is not always necessary to do it in the first cycle,
It is also possible to carry out the subsequent cycle such as the second cycle or the third cycle in which the temperature control in the firing step is stabilized to some extent.

Further, in the above description of the operation, the ON state time in the ON / OFF control of the main heater 26 is measured, but it may be configured to measure the OFF state time. The processing in this case can be performed in exactly the same manner as described above.

[0034]

According to the sensor attachment state inspection device for a bread maker according to claim 1 of the present invention, during the inspection step of the attachment state of the temperature detection sensor, the heating heater is turned on to set the internal temperature of the inner case to the baking temperature. Then, turn on the heater to keep the internal temperature of the inner case at the firing temperature.
Control means for controlling OFF, measuring means for measuring time of ON state or OFF state of heating heater in ON / OFF control of heating heater by this control means, time measured by this measuring means and preset inside Comparing means for making a comparison with the reference time, and a judging means for judging that the mounting state of the temperature detection sensor is defective when the measured time exceeds the reference time, based on the comparison result of the comparing means. Since the configuration includes the notifying unit for notifying the defective mounting based on the determination result of the determining unit, the defective sensor mounting state that slightly affects the baking performance is inspected in the completed product state. be able to. Further, the sensor attachment state inspection device for a bread maker according to claim 2 of the present invention, as the measuring means, measures the time of the on state or the off state in the first on / off control of the heating heater by the control means. Since it was configured to
Since the internal temperature is measured at the timing most easily measured before the temperature converges to the firing temperature, the accuracy of determining whether the sensor is attached properly or not is improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of a sensor attachment state inspection device for a bread maker according to the present invention.

FIG. 2 is a flowchart for explaining the operation of the sensor attachment state inspection device for a bread maker according to the present invention.

FIG. 3 is a timing chart for explaining the operation of the sensor attachment state inspection device for a bread maker according to the present invention.

FIG. 4 is a vertical cross-sectional view showing a schematic structure of a bread maker to which the sensor attachment state inspection device of the present invention is applied.

FIG. 5 is a front view of a bread maker to which the sensor mounting state inspection device of the present invention is applied.

[Explanation of symbols]

 1 Bread Maker 2 Baking Kettle Main Body 3 Outer Case 4 Bottom Case 6 Inner Case 20 Baking Case 26 Main Heater 27 Oven Sensor 41 Bread Preparation Circuit 42 Inspection Switch 43 Relay 44 Normally Open Switch 45 Power Supply 46 Measuring Circuit 47 Comparison Circuit 48 Discrimination Circuit 49 Notification circuit

Claims (2)

[Claims] 1. A baking case in which a bread material is charged for kneading, fermentation and baking is disposed inside an inner case forming an oven chamber, and the bread material charged in the baking case is cooked. In a bread maker in which a heating heater and a temperature detection sensor for managing a cooking temperature are attached to the inner case, the heating heater is turned on during the inspection process of the attachment state of the temperature detection sensor. A control means for turning on / off the heating heater to keep the internal temperature of the inner case at the firing temperature after raising the internal temperature to the firing temperature; and on / off control of the heating heater by the control means. Measuring means for measuring the time when the heating heater is in the on state or the off state, the time measured by the measuring means and the reference set in advance inside Comparing means for comparing with the time, and judging means for judging that the mounting state of the temperature detection sensor is defective when the measured time exceeds the reference time based on the comparison result of the comparing means, A sensor attachment state inspection device for a bread maker, comprising: an informing unit for informing of a mounting failure based on a determination result of the determining unit. 2. The sensor mounting state of the bread maker according to claim 1, wherein the measuring means measures a time of an on state or an off state in the first on / off control of the heating heater by the control means. Inspection device.